QUOTE (Jaid @ Dec 10 2008, 01:49 AM)
it doesn't function on the same principle. the depleted uranium sword is just a really hard, really heavy, (slightly more radioactive than the environment) sword.
Actually, uranium isn't particularly hard; you can cut it with a knife. This is why it is typically alloyed with nickle and zinc when used as a penetrator. Staballoys (depleted uranium alloys) are inferior in hardness to hardened steel; but their high density make them excellent armor penetrators, particularly combined with the fact that they're self-sharpening at high velocities (far higher than a human arm can achieve, so this self-sharpening is useless in a sword).
QUOTE
I would agree that it would have to be a two hand sword if it was nothing but DU, but I was thinking of the compound construction like a Katana or Damascus. Were it would reduce the weight but keep the desired material properties.
Fuck no.
What you refer to is called pattern welding. Pattern welding was used when high-quality steel was extremely expensive and difficult to make, primarily to save money. You take a piece of cheap low-carbon steel and a piece of expensive high-carbon steel, heat them up, and pound them together until they fuse into one piece of steel through the miracle of solid-state diffusion. The result is a piece of steel with averaged carbon content and averaged cost. It fell out of favor with the advent of scalable industrial steelmaking techniques, which allowed the reliable mass-production of high-quality steel.
Note that this is not "Damascus" steel. Pattern welded blades are often marketed as such by knife-makers, but the two are very different. Traditional Damascus steel is a variety of wootz (an Indian crucible steel made by melting iron, charcoal, and glass together) made using a particular iron ore found in a mine near Damascus, Syria which has long since ran dry. The unique and unknown properties of that ore allowed teh Damascus steelmakers to created a variety of wootz which contained iron-carbide nanowires and carbon nanotubes. These nanostructures in the steel gave Damascus steel great strength and durability. Currently, no one knows how to reproduce it. The ore used hasn't been around since with 18th century and the smiths who know the process used to make it are all long dead.
The important point is that pattern-welding isn't used in real Damascus blades.
Also, and this applies to your suggestion more than anything else, you can only do pattern welding with like metals.
You can do forge welding with differing metals, sure, but the process is different, it involves creating a eutectic alloy between the two metals being welded, since they can't be fused into a single piece. I'll admit that I don't know enough about uranium alloying to know if it is possible to create a uranium-steel eutectic. What I do know is that there wouldn't be any point in it since steel alone will produce a superior blade and it would be damned dangerous to try.
Uranium, you see, is pyrophoric. It's ignition temperature is lower than room temperature. All you need is to give it a little push, make some sparks. Heating it in a furnace and pounding it with a hammer is thus extremely unwise. If you heat it too much before hammering, you'll end up with a chunk of burning metal and a lung-full of uranium-oxide smoke. This is not good.
Since uranium is softer than steel, and heavier than steel, and you can't take advantage of its self-sharpening properties in a hand-held weapon, and its pyrophoric properties really wouldn't be that useful in a sword, there is really no reason to even try such insanity. If you did, you'd end up with a weapon that is far inferior to a steel sword. The edge wouldn't be nearly as strong, because uranium can't be hardened the way steel can be and the extra weight would make it far too heavy to actually wield in combat.